src/test/examplesJava17/backport/ObjectsBackportJava17Test.java

// Copyright (c) 2024, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package backport;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestRuntime.CfVm;
import java.util.Objects;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class ObjectsBackportJava17Test extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

  @Parameters(name = "{0}")
  public static Iterable<?> data() {
    return getTestParameters()
        .withDexRuntimes()
        .withCfRuntimesStartingFromIncluding(CfVm.JDK17)
        .withAllApiLevelsAlsoForCf()
        .build();
  }

  @Test
  public void test() throws Exception {
    testForDesugaring(parameters)
        .addInnerClassesAndStrippedOuter(getClass())
        .run(parameters.getRuntime(), TestClass.class)
        .assertSuccess();
  }

  public static class TestClass {

    public static void main(String[] args) {
      // The methods are actually from Java 16, but we can test them from Java 17.
      testCheckIndex();
      testCheckFromToIndex();
      testCheckFromIndexSize();
    }

    private static void testCheckIndex() {
      for (long i = 0L; i < 10L; i++) {
        assertEquals(i, Objects.checkIndex(i, 10L));
      }

      try {
        throw new AssertionError(Objects.checkIndex(-1L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkIndex(10L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkIndex(0L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }
    }

    private static void testCheckFromToIndex() {
      for (long i = 0L; i <= 10L; i++) {
        for (long j = i; j <= 10L; j++) {
          assertEquals(i, Objects.checkFromToIndex(i, j, 10L));
        }
      }
      assertEquals(0L, Objects.checkFromToIndex(0L, 0L, 0L));

      try {
        throw new AssertionError(Objects.checkFromToIndex(4L, 2L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromToIndex(-1L, 5L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromToIndex(0L, -1L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromToIndex(11L, 11L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromToIndex(0L, 1L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromToIndex(1L, 1L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }
    }

    private static void testCheckFromIndexSize() {
      for (long i = 0L; i <= 10L; i++) {
        for (long j = 10L - i; j >= 0L; j--) {
          assertEquals(i, Objects.checkFromIndexSize(i, j, 10L));
        }
      }
      assertEquals(0, Objects.checkFromIndexSize(0L, 0L, 0L));

      try {
        throw new AssertionError(Objects.checkFromIndexSize(8L, 4L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromIndexSize(-1L, 5L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromIndexSize(11L, 0L, 10L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromIndexSize(0L, 1L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromIndexSize(1L, 1L, 0L));
      } catch (IndexOutOfBoundsException expected) {
      }

      // Check for cases where overflow might occur producing incorrect results.
      try {
        throw new AssertionError(Objects.checkFromIndexSize(Long.MAX_VALUE, 1L, Long.MAX_VALUE));
      } catch (IndexOutOfBoundsException expected) {
      }
      try {
        throw new AssertionError(Objects.checkFromIndexSize(0L, 1L, Long.MIN_VALUE));
      } catch (IndexOutOfBoundsException expected) {
      }
    }

    private static void assertEquals(long expected, long actual) {
      if (expected != actual) {
        throw new AssertionError("Expected <" + expected + "> but was <" + actual + '>');
      }
    }
  }
}